From patchwork Fri Aug 5 16:39:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 12937565 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 867CFC00140 for ; Fri, 5 Aug 2022 16:39:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241114AbiHEQjs (ORCPT ); Fri, 5 Aug 2022 12:39:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241091AbiHEQjp (ORCPT ); Fri, 5 Aug 2022 12:39:45 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6DBFF79EF8 for ; Fri, 5 Aug 2022 09:39:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1659717577; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=I2qG/DrMQ1sR/wng6kjZ4mlPv6kuW7pRnO/xQHwpD34=; b=JCZDN35PYmnHkWDPKDsC9AvBxw6SF4UGtdxokG7P9BFZf2WI44a/Nhw++FO1UPHd/TeM9X u3ebOgSeuRsnAaq+Utz0G7hgG0Iq79bWcuO1UNaC45pXPNAfdM2YuS6g2Nvj2iipBsSQ7f Urjmh4hXw3zPzd3p24LYXYS9lKF5rtg= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-156-GCdQiKavOOWsEevuDZr8EQ-1; Fri, 05 Aug 2022 12:39:33 -0400 X-MC-Unique: GCdQiKavOOWsEevuDZr8EQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A23DD38149BE; Fri, 5 Aug 2022 16:39:32 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.193.29]) by smtp.corp.redhat.com (Postfix) with ESMTP id F02872166B26; Fri, 5 Aug 2022 16:39:29 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Eli Cohen , Zhu Lingshan , "Michael S. Tsirkin" , Gautam Dawar , Stefano Garzarella , Parav Pandit , Cindy Lu , "Gonglei (Arei)" , Jason Wang , Cornelia Huck , kvm@vger.kernel.org, Paolo Bonzini , Liuxiangdong , Laurent Vivier , Harpreet Singh Anand Subject: [PATCH v4 6/6] vdpa: Always start CVQ in SVQ mode Date: Fri, 5 Aug 2022 18:39:09 +0200 Message-Id: <20220805163909.872646-7-eperezma@redhat.com> In-Reply-To: <20220805163909.872646-1-eperezma@redhat.com> References: <20220805163909.872646-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Isolate control virtqueue in its own group, allowing to intercept control commands but letting dataplane run totally passthrough to the guest. Signed-off-by: Eugenio Pérez --- v4: * Squash vhost_vdpa_cvq_group_is_independent. * Rebased on last CVQ start series, that allocated CVQ cmd bufs at load * Do not check for cvq index on vhost_vdpa_net_prepare, we only have one that callback registered in that NetClientInfo. v3: * Make asid related queries print a warning instead of returning an error and stop the start of qemu. --- hw/virtio/vhost-vdpa.c | 3 +- net/vhost-vdpa.c | 124 +++++++++++++++++++++++++++++++++++++++-- 2 files changed, 122 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 3eb67b27b7..69f34f4cc5 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -678,7 +678,8 @@ static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) { uint64_t features; uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2 | - 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH; + 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH | + 0x1ULL << VHOST_BACKEND_F_IOTLB_ASID; int r; if (vhost_vdpa_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) { diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index bf78b1332f..c820a5fd9f 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -37,6 +37,9 @@ typedef struct VhostVDPAState { /* Control commands shadow buffers */ void *cvq_cmd_out_buffer, *cvq_cmd_in_buffer; + /* Number of address spaces supported by the device */ + unsigned address_space_num; + /* The device always have SVQ enabled */ bool always_svq; bool started; @@ -100,6 +103,9 @@ static const uint64_t vdpa_svq_device_features = BIT_ULL(VIRTIO_NET_F_RSC_EXT) | BIT_ULL(VIRTIO_NET_F_STANDBY); +#define VHOST_VDPA_NET_CVQ_PASSTHROUGH 0 +#define VHOST_VDPA_NET_CVQ_ASID 1 + VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) { VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); @@ -224,6 +230,37 @@ static NetClientInfo net_vhost_vdpa_info = { .check_peer_type = vhost_vdpa_check_peer_type, }; +static void vhost_vdpa_get_vring_group(int device_fd, + struct vhost_vring_state *state) +{ + int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, state); + if (unlikely(r < 0)) { + /* + * Assume all groups are 0, the consequences are the same and we will + * not abort device creation + */ + state->num = 0; + } +} + +static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, + unsigned vq_group, + unsigned asid_num) +{ + struct vhost_vring_state asid = { + .index = vq_group, + .num = asid_num, + }; + int ret; + + ret = ioctl(v->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); + if (unlikely(ret < 0)) { + warn_report("Can't set vq group %u asid %u, errno=%d (%s)", + asid.index, asid.num, errno, g_strerror(errno)); + } + return ret; +} + static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) { VhostIOVATree *tree = v->iova_tree; @@ -298,11 +335,55 @@ dma_map_err: static int vhost_vdpa_net_cvq_prepare(NetClientState *nc) { VhostVDPAState *s; + struct vhost_vdpa *v; + struct vhost_vring_state cvq_group = {}; int r; assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); s = DO_UPCAST(VhostVDPAState, nc, nc); + v = &s->vhost_vdpa; + cvq_group.index = v->dev->vq_index_end - 1; + + /* Default values */ + v->shadow_vqs_enabled = false; + s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_PASSTHROUGH; + + if (s->always_svq) { + v->shadow_vqs_enabled = true; + goto out; + } + + if (s->address_space_num < 2) { + return 0; + } + + /** + * Check if all the virtqueues of the virtio device are in a different vq + * than the last vq. VQ group of last group passed in cvq_group. + */ + vhost_vdpa_get_vring_group(v->device_fd, &cvq_group); + for (int i = 0; i < (v->dev->vq_index_end - 1); ++i) { + struct vhost_vring_state vq_group = { + .index = i, + }; + + vhost_vdpa_get_vring_group(v->device_fd, &vq_group); + if (unlikely(vq_group.num == cvq_group.num)) { + warn_report("CVQ %u group is the same as VQ %u one (%u)", + cvq_group.index, vq_group.index, cvq_group.num); + return 0; + } + } + + r = vhost_vdpa_set_address_space_id(v, cvq_group.num, + VHOST_VDPA_NET_CVQ_ASID); + if (r == 0) { + v->shadow_vqs_enabled = true; + s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID; + } + +out: if (!s->vhost_vdpa.shadow_vqs_enabled) { return 0; } @@ -523,12 +604,38 @@ static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { .avail_handler = vhost_vdpa_net_handle_ctrl_avail, }; +static uint32_t vhost_vdpa_get_as_num(int vdpa_device_fd) +{ + uint64_t features; + unsigned num_as; + int r; + + r = ioctl(vdpa_device_fd, VHOST_GET_BACKEND_FEATURES, &features); + if (unlikely(r < 0)) { + warn_report("Cannot get backend features"); + return 1; + } + + if (!(features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) { + return 1; + } + + r = ioctl(vdpa_device_fd, VHOST_VDPA_GET_AS_NUM, &num_as); + if (unlikely(r < 0)) { + warn_report("Cannot retrieve number of supported ASs"); + return 1; + } + + return num_as; +} + static NetClientState *net_vhost_vdpa_init(NetClientState *peer, const char *device, const char *name, int vdpa_device_fd, int queue_pair_index, int nvqs, + unsigned nas, bool is_datapath, bool svq, VhostIOVATree *iova_tree) @@ -547,6 +654,7 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer, snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); s = DO_UPCAST(VhostVDPAState, nc, nc); + s->address_space_num = nas; s->vhost_vdpa.device_fd = vdpa_device_fd; s->vhost_vdpa.index = queue_pair_index; s->always_svq = svq; @@ -632,6 +740,8 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, g_autoptr(VhostIOVATree) iova_tree = NULL; NetClientState *nc; int queue_pairs, r, i = 0, has_cvq = 0; + unsigned num_as = 1; + bool svq_cvq; assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); opts = &netdev->u.vhost_vdpa; @@ -656,7 +766,13 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, goto err; } - if (opts->x_svq) { + svq_cvq = opts->x_svq; + if (has_cvq && !opts->x_svq) { + num_as = vhost_vdpa_get_as_num(vdpa_device_fd); + svq_cvq = num_as > 1; + } + + if (opts->x_svq || svq_cvq) { struct vhost_vdpa_iova_range iova_range; uint64_t invalid_dev_features = @@ -679,15 +795,15 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, for (i = 0; i < queue_pairs; i++) { ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, - vdpa_device_fd, i, 2, true, opts->x_svq, - iova_tree); + vdpa_device_fd, i, 2, num_as, true, + opts->x_svq, iova_tree); if (!ncs[i]) goto err; } if (has_cvq) { nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, - vdpa_device_fd, i, 1, false, + vdpa_device_fd, i, 1, num_as, false, opts->x_svq, iova_tree); if (!nc) goto err;